1.Consider a 1200 kg car and solve the questions below (worth 30 marks).a)Findthecostoftransportation(per kilometre)inunitsofMJ/kmifthis...

1.











Consider a 1200 kg car and solve the questions below (worth 30 marks).

a)








Find


the





cost


of


transportation

(per kilometre)


in


units


of


MJ/km


if


this car


drives


1




kilometer at an average speed of


15


m/s (54 kph).

Draw a simple car

showing the cross section and 3 arrows to identify the direction of the movement and forces. Assume:








h


= 21% engine;


stops and starts 5 times per km (city driving);


C


rr


=0.025


cross


section is 3.5m


by 2.55m;


C


d


=0.32; air density 1.29


kg/m


3


.

b)








Convert this cost of transportation from MJ/km into

fuel expense units


of litres of gasoline per 100 km, note, it needs to be per 100 km not 1 km.